feat: themes

1 files changed, 224 insertions, 308 deletions

diff --git a/internal/diff/diff.go b/internal/diff/diff.go
index a2edb7e74..8f5e669d3 100644
--- a/internal/diff/diff.go
+++ b/internal/diff/diff.go
@@ -16,6 +16,7 @@ import (
 	"github.com/charmbracelet/lipgloss"
 	"github.com/charmbracelet/x/ansi"
 	"github.com/opencode-ai/opencode/internal/config"
+	"github.com/opencode-ai/opencode/internal/tui/theme"
 	"github.com/sergi/go-diff/diffmatchpatch"
 )
 
@@ -69,143 +70,6 @@ type linePair struct {
 }
 
 // -------------------------------------------------------------------------
-// Style Configuration
-// -------------------------------------------------------------------------
-
-// StyleConfig defines styling for diff rendering
-type StyleConfig struct {
-	ShowHeader     bool
-	ShowHunkHeader bool
-	FileNameFg     lipgloss.Color
-	// Background colors
-	RemovedLineBg       lipgloss.Color
-	AddedLineBg         lipgloss.Color
-	ContextLineBg       lipgloss.Color
-	HunkLineBg          lipgloss.Color
-	RemovedLineNumberBg lipgloss.Color
-	AddedLineNamerBg    lipgloss.Color
-
-	// Foreground colors
-	HunkLineFg         lipgloss.Color
-	RemovedFg          lipgloss.Color
-	AddedFg            lipgloss.Color
-	LineNumberFg       lipgloss.Color
-	RemovedHighlightFg lipgloss.Color
-	AddedHighlightFg   lipgloss.Color
-
-	// Highlight settings
-	HighlightStyle     string
-	RemovedHighlightBg lipgloss.Color
-	AddedHighlightBg   lipgloss.Color
-}
-
-// StyleOption is a function that modifies a StyleConfig
-type StyleOption func(*StyleConfig)
-
-// NewStyleConfig creates a StyleConfig with default values
-func NewStyleConfig(opts ...StyleOption) StyleConfig {
-	// Default color scheme
-	config := StyleConfig{
-		ShowHeader:          true,
-		ShowHunkHeader:      true,
-		FileNameFg:          lipgloss.Color("#a0a0a0"),
-		RemovedLineBg:       lipgloss.Color("#3A3030"),
-		AddedLineBg:         lipgloss.Color("#303A30"),
-		ContextLineBg:       lipgloss.Color("#212121"),
-		HunkLineBg:          lipgloss.Color("#212121"),
-		HunkLineFg:          lipgloss.Color("#a0a0a0"),
-		RemovedFg:           lipgloss.Color("#7C4444"),
-		AddedFg:             lipgloss.Color("#478247"),
-		LineNumberFg:        lipgloss.Color("#888888"),
-		HighlightStyle:      "dracula",
-		RemovedHighlightBg:  lipgloss.Color("#612726"),
-		AddedHighlightBg:    lipgloss.Color("#256125"),
-		RemovedLineNumberBg: lipgloss.Color("#332929"),
-		AddedLineNamerBg:    lipgloss.Color("#293229"),
-		RemovedHighlightFg:  lipgloss.Color("#FADADD"),
-		AddedHighlightFg:    lipgloss.Color("#DAFADA"),
-	}
-
-	// Apply all provided options
-	for _, opt := range opts {
-		opt(&config)
-	}
-
-	return config
-}
-
-// Style option functions
-func WithFileNameFg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.FileNameFg = color }
-}
-
-func WithRemovedLineBg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.RemovedLineBg = color }
-}
-
-func WithAddedLineBg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.AddedLineBg = color }
-}
-
-func WithContextLineBg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.ContextLineBg = color }
-}
-
-func WithRemovedFg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.RemovedFg = color }
-}
-
-func WithAddedFg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.AddedFg = color }
-}
-
-func WithLineNumberFg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.LineNumberFg = color }
-}
-
-func WithHighlightStyle(style string) StyleOption {
-	return func(s *StyleConfig) { s.HighlightStyle = style }
-}
-
-func WithRemovedHighlightColors(bg, fg lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) {
-		s.RemovedHighlightBg = bg
-		s.RemovedHighlightFg = fg
-	}
-}
-
-func WithAddedHighlightColors(bg, fg lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) {
-		s.AddedHighlightBg = bg
-		s.AddedHighlightFg = fg
-	}
-}
-
-func WithRemovedLineNumberBg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.RemovedLineNumberBg = color }
-}
-
-func WithAddedLineNumberBg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.AddedLineNamerBg = color }
-}
-
-func WithHunkLineBg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.HunkLineBg = color }
-}
-
-func WithHunkLineFg(color lipgloss.Color) StyleOption {
-	return func(s *StyleConfig) { s.HunkLineFg = color }
-}
-
-func WithShowHeader(show bool) StyleOption {
-	return func(s *StyleConfig) { s.ShowHeader = show }
-}
-
-func WithShowHunkHeader(show bool) StyleOption {
-	return func(s *StyleConfig) { s.ShowHunkHeader = show }
-}
-
-// -------------------------------------------------------------------------
 // Parse Configuration
 // -------------------------------------------------------------------------
 
@@ -233,7 +97,6 @@ func WithContextSize(size int) ParseOption {
 // SideBySideConfig configures the rendering of side-by-side diffs
 type SideBySideConfig struct {
 	TotalWidth int
-	Style      StyleConfig
 }
 
 // SideBySideOption modifies a SideBySideConfig
@@ -243,7 +106,6 @@ type SideBySideOption func(*SideBySideConfig)
 func NewSideBySideConfig(opts ...SideBySideOption) SideBySideConfig {
 	config := SideBySideConfig{
 		TotalWidth: 160, // Default width for side-by-side view
-		Style:      NewStyleConfig(),
 	}
 
 	for _, opt := range opts {
@@ -262,20 +124,6 @@ func WithTotalWidth(width int) SideBySideOption {
 	}
 }
 
-// WithStyle sets the styling configuration
-func WithStyle(style StyleConfig) SideBySideOption {
-	return func(s *SideBySideConfig) {
-		s.Style = style
-	}
-}
-
-// WithStyleOptions applies the specified style options
-func WithStyleOptions(opts ...StyleOption) SideBySideOption {
-	return func(s *SideBySideConfig) {
-		s.Style = NewStyleConfig(opts...)
-	}
-}
-
 // -------------------------------------------------------------------------
 // Diff Parsing
 // -------------------------------------------------------------------------
@@ -382,7 +230,7 @@ func ParseUnifiedDiff(diff string) (DiffResult, error) {
 }
 
 // HighlightIntralineChanges updates lines in a hunk to show character-level differences
-func HighlightIntralineChanges(h *Hunk, style StyleConfig) {
+func HighlightIntralineChanges(h *Hunk) {
 	var updated []DiffLine
 	dmp := diffmatchpatch.New()
 
@@ -476,6 +324,8 @@ func pairLines(lines []DiffLine) []linePair {
 
 // SyntaxHighlight applies syntax highlighting to text based on file extension
 func SyntaxHighlight(w io.Writer, source, fileName, formatter string, bg lipgloss.TerminalColor) error {
+	t := theme.CurrentTheme()
+
 	// Determine the language lexer to use
 	l := lexers.Match(fileName)
 	if l == nil {
@@ -491,93 +341,175 @@ func SyntaxHighlight(w io.Writer, source, fileName, formatter string, bg lipglos
 	if f == nil {
 		f = formatters.Fallback
 	}
-	theme := `
-	<style name="vscode-dark-plus">
+
+	// Dynamic theme based on current theme values
+	syntaxThemeXml := fmt.Sprintf(`
+	<style name="opencode-theme">
 	<!-- Base colors -->
-	<entry type="Background" style="bg:#1E1E1E"/>
-	<entry type="Text" style="#D4D4D4"/>
-	<entry type="Other" style="#D4D4D4"/>
-	<entry type="Error" style="#F44747"/>
-	<!-- Keywords - using the Control flow / Special keywords color -->
-	<entry type="Keyword" style="#C586C0"/>
-	<entry type="KeywordConstant" style="#4FC1FF"/>
-	<entry type="KeywordDeclaration" style="#C586C0"/>
-	<entry type="KeywordNamespace" style="#C586C0"/>
-	<entry type="KeywordPseudo" style="#C586C0"/>
-	<entry type="KeywordReserved" style="#C586C0"/>
-	<entry type="KeywordType" style="#4EC9B0"/>
+	<entry type="Background" style="bg:%s"/>
+	<entry type="Text" style="%s"/>
+	<entry type="Other" style="%s"/>
+	<entry type="Error" style="%s"/>
+	<!-- Keywords -->
+	<entry type="Keyword" style="%s"/>
+	<entry type="KeywordConstant" style="%s"/>
+	<entry type="KeywordDeclaration" style="%s"/>
+	<entry type="KeywordNamespace" style="%s"/>
+	<entry type="KeywordPseudo" style="%s"/>
+	<entry type="KeywordReserved" style="%s"/>
+	<entry type="KeywordType" style="%s"/>
 	<!-- Names -->
-	<entry type="Name" style="#D4D4D4"/>
-	<entry type="NameAttribute" style="#9CDCFE"/>
-	<entry type="NameBuiltin" style="#4EC9B0"/>
-	<entry type="NameBuiltinPseudo" style="#9CDCFE"/>
-	<entry type="NameClass" style="#4EC9B0"/>
-	<entry type="NameConstant" style="#4FC1FF"/>
-	<entry type="NameDecorator" style="#DCDCAA"/>
-	<entry type="NameEntity" style="#9CDCFE"/>
-	<entry type="NameException" style="#4EC9B0"/>
-	<entry type="NameFunction" style="#DCDCAA"/>
-	<entry type="NameLabel" style="#C8C8C8"/>
-	<entry type="NameNamespace" style="#4EC9B0"/>
-	<entry type="NameOther" style="#9CDCFE"/>
-	<entry type="NameTag" style="#569CD6"/>
-	<entry type="NameVariable" style="#9CDCFE"/>
-	<entry type="NameVariableClass" style="#9CDCFE"/>
-	<entry type="NameVariableGlobal" style="#9CDCFE"/>
-	<entry type="NameVariableInstance" style="#9CDCFE"/>
+	<entry type="Name" style="%s"/>
+	<entry type="NameAttribute" style="%s"/>
+	<entry type="NameBuiltin" style="%s"/>
+	<entry type="NameBuiltinPseudo" style="%s"/>
+	<entry type="NameClass" style="%s"/>
+	<entry type="NameConstant" style="%s"/>
+	<entry type="NameDecorator" style="%s"/>
+	<entry type="NameEntity" style="%s"/>
+	<entry type="NameException" style="%s"/>
+	<entry type="NameFunction" style="%s"/>
+	<entry type="NameLabel" style="%s"/>
+	<entry type="NameNamespace" style="%s"/>
+	<entry type="NameOther" style="%s"/>
+	<entry type="NameTag" style="%s"/>
+	<entry type="NameVariable" style="%s"/>
+	<entry type="NameVariableClass" style="%s"/>
+	<entry type="NameVariableGlobal" style="%s"/>
+	<entry type="NameVariableInstance" style="%s"/>
 	<!-- Literals -->
-	<entry type="Literal" style="#CE9178"/>
-	<entry type="LiteralDate" style="#CE9178"/>
-	<entry type="LiteralString" style="#CE9178"/>
-	<entry type="LiteralStringBacktick" style="#CE9178"/>
-	<entry type="LiteralStringChar" style="#CE9178"/>
-	<entry type="LiteralStringDoc" style="#CE9178"/>
-	<entry type="LiteralStringDouble" style="#CE9178"/>
-	<entry type="LiteralStringEscape" style="#d7ba7d"/>
-	<entry type="LiteralStringHeredoc" style="#CE9178"/>
-	<entry type="LiteralStringInterpol" style="#CE9178"/>
-	<entry type="LiteralStringOther" style="#CE9178"/>
-	<entry type="LiteralStringRegex" style="#d16969"/>
-	<entry type="LiteralStringSingle" style="#CE9178"/>
-	<entry type="LiteralStringSymbol" style="#CE9178"/>
-	<!-- Numbers - using the numberLiteral color -->
-	<entry type="LiteralNumber" style="#b5cea8"/>
-	<entry type="LiteralNumberBin" style="#b5cea8"/>
-	<entry type="LiteralNumberFloat" style="#b5cea8"/>
-	<entry type="LiteralNumberHex" style="#b5cea8"/>
-	<entry type="LiteralNumberInteger" style="#b5cea8"/>
-	<entry type="LiteralNumberIntegerLong" style="#b5cea8"/>
-	<entry type="LiteralNumberOct" style="#b5cea8"/>
+	<entry type="Literal" style="%s"/>
+	<entry type="LiteralDate" style="%s"/>
+	<entry type="LiteralString" style="%s"/>
+	<entry type="LiteralStringBacktick" style="%s"/>
+	<entry type="LiteralStringChar" style="%s"/>
+	<entry type="LiteralStringDoc" style="%s"/>
+	<entry type="LiteralStringDouble" style="%s"/>
+	<entry type="LiteralStringEscape" style="%s"/>
+	<entry type="LiteralStringHeredoc" style="%s"/>
+	<entry type="LiteralStringInterpol" style="%s"/>
+	<entry type="LiteralStringOther" style="%s"/>
+	<entry type="LiteralStringRegex" style="%s"/>
+	<entry type="LiteralStringSingle" style="%s"/>
+	<entry type="LiteralStringSymbol" style="%s"/>
+	<!-- Numbers -->
+	<entry type="LiteralNumber" style="%s"/>
+	<entry type="LiteralNumberBin" style="%s"/>
+	<entry type="LiteralNumberFloat" style="%s"/>
+	<entry type="LiteralNumberHex" style="%s"/>
+	<entry type="LiteralNumberInteger" style="%s"/>
+	<entry type="LiteralNumberIntegerLong" style="%s"/>
+	<entry type="LiteralNumberOct" style="%s"/>
 	<!-- Operators -->
-	<entry type="Operator" style="#D4D4D4"/>
-	<entry type="OperatorWord" style="#C586C0"/>
-	<entry type="Punctuation" style="#D4D4D4"/>
-	<!-- Comments - standard VSCode Dark+ comment color -->
-	<entry type="Comment" style="#6A9955"/>
-	<entry type="CommentHashbang" style="#6A9955"/>
-	<entry type="CommentMultiline" style="#6A9955"/>
-	<entry type="CommentSingle" style="#6A9955"/>
-	<entry type="CommentSpecial" style="#6A9955"/>
-	<entry type="CommentPreproc" style="#C586C0"/>
+	<entry type="Operator" style="%s"/>
+	<entry type="OperatorWord" style="%s"/>
+	<entry type="Punctuation" style="%s"/>
+	<!-- Comments -->
+	<entry type="Comment" style="%s"/>
+	<entry type="CommentHashbang" style="%s"/>
+	<entry type="CommentMultiline" style="%s"/>
+	<entry type="CommentSingle" style="%s"/>
+	<entry type="CommentSpecial" style="%s"/>
+	<entry type="CommentPreproc" style="%s"/>
 	<!-- Generic styles -->
-	<entry type="Generic" style="#D4D4D4"/>
-	<entry type="GenericDeleted" style="#F44747"/>
-	<entry type="GenericEmph" style="italic #D4D4D4"/>
-	<entry type="GenericError" style="#F44747"/>
-	<entry type="GenericHeading" style="bold #D4D4D4"/>
-	<entry type="GenericInserted" style="#b5cea8"/>
-	<entry type="GenericOutput" style="#808080"/>
-	<entry type="GenericPrompt" style="#D4D4D4"/>
-	<entry type="GenericStrong" style="bold #D4D4D4"/>
-	<entry type="GenericSubheading" style="bold #D4D4D4"/>
-	<entry type="GenericTraceback" style="#F44747"/>
+	<entry type="Generic" style="%s"/>
+	<entry type="GenericDeleted" style="%s"/>
+	<entry type="GenericEmph" style="italic %s"/>
+	<entry type="GenericError" style="%s"/>
+	<entry type="GenericHeading" style="bold %s"/>
+	<entry type="GenericInserted" style="%s"/>
+	<entry type="GenericOutput" style="%s"/>
+	<entry type="GenericPrompt" style="%s"/>
+	<entry type="GenericStrong" style="bold %s"/>
+	<entry type="GenericSubheading" style="bold %s"/>
+	<entry type="GenericTraceback" style="%s"/>
 	<entry type="GenericUnderline" style="underline"/>
-	<entry type="TextWhitespace" style="#D4D4D4"/>
+	<entry type="TextWhitespace" style="%s"/>
 </style>
-`
+`,
+		getColor(t.Background()), // Background
+		getColor(t.Text()),       // Text
+		getColor(t.Text()),       // Other
+		getColor(t.Error()),      // Error
+
+		getColor(t.SyntaxKeyword()), // Keyword
+		getColor(t.SyntaxKeyword()), // KeywordConstant
+		getColor(t.SyntaxKeyword()), // KeywordDeclaration
+		getColor(t.SyntaxKeyword()), // KeywordNamespace
+		getColor(t.SyntaxKeyword()), // KeywordPseudo
+		getColor(t.SyntaxKeyword()), // KeywordReserved
+		getColor(t.SyntaxType()),    // KeywordType
+
+		getColor(t.Text()),           // Name
+		getColor(t.SyntaxVariable()), // NameAttribute
+		getColor(t.SyntaxType()),     // NameBuiltin
+		getColor(t.SyntaxVariable()), // NameBuiltinPseudo
+		getColor(t.SyntaxType()),     // NameClass
+		getColor(t.SyntaxVariable()), // NameConstant
+		getColor(t.SyntaxFunction()), // NameDecorator
+		getColor(t.SyntaxVariable()), // NameEntity
+		getColor(t.SyntaxType()),     // NameException
+		getColor(t.SyntaxFunction()), // NameFunction
+		getColor(t.Text()),           // NameLabel
+		getColor(t.SyntaxType()),     // NameNamespace
+		getColor(t.SyntaxVariable()), // NameOther
+		getColor(t.SyntaxKeyword()),  // NameTag
+		getColor(t.SyntaxVariable()), // NameVariable
+		getColor(t.SyntaxVariable()), // NameVariableClass
+		getColor(t.SyntaxVariable()), // NameVariableGlobal
+		getColor(t.SyntaxVariable()), // NameVariableInstance
+
+		getColor(t.SyntaxString()), // Literal
+		getColor(t.SyntaxString()), // LiteralDate
+		getColor(t.SyntaxString()), // LiteralString
+		getColor(t.SyntaxString()), // LiteralStringBacktick
+		getColor(t.SyntaxString()), // LiteralStringChar
+		getColor(t.SyntaxString()), // LiteralStringDoc
+		getColor(t.SyntaxString()), // LiteralStringDouble
+		getColor(t.SyntaxString()), // LiteralStringEscape
+		getColor(t.SyntaxString()), // LiteralStringHeredoc
+		getColor(t.SyntaxString()), // LiteralStringInterpol
+		getColor(t.SyntaxString()), // LiteralStringOther
+		getColor(t.SyntaxString()), // LiteralStringRegex
+		getColor(t.SyntaxString()), // LiteralStringSingle
+		getColor(t.SyntaxString()), // LiteralStringSymbol
+
+		getColor(t.SyntaxNumber()), // LiteralNumber
+		getColor(t.SyntaxNumber()), // LiteralNumberBin
+		getColor(t.SyntaxNumber()), // LiteralNumberFloat
+		getColor(t.SyntaxNumber()), // LiteralNumberHex
+		getColor(t.SyntaxNumber()), // LiteralNumberInteger
+		getColor(t.SyntaxNumber()), // LiteralNumberIntegerLong
+		getColor(t.SyntaxNumber()), // LiteralNumberOct
+
+		getColor(t.SyntaxOperator()),    // Operator
+		getColor(t.SyntaxKeyword()),     // OperatorWord
+		getColor(t.SyntaxPunctuation()), // Punctuation
+
+		getColor(t.SyntaxComment()), // Comment
+		getColor(t.SyntaxComment()), // CommentHashbang
+		getColor(t.SyntaxComment()), // CommentMultiline
+		getColor(t.SyntaxComment()), // CommentSingle
+		getColor(t.SyntaxComment()), // CommentSpecial
+		getColor(t.SyntaxKeyword()), // CommentPreproc
+
+		getColor(t.Text()),      // Generic
+		getColor(t.Error()),     // GenericDeleted
+		getColor(t.Text()),      // GenericEmph
+		getColor(t.Error()),     // GenericError
+		getColor(t.Text()),      // GenericHeading
+		getColor(t.Success()),   // GenericInserted
+		getColor(t.TextMuted()), // GenericOutput
+		getColor(t.Text()),      // GenericPrompt
+		getColor(t.Text()),      // GenericStrong
+		getColor(t.Text()),      // GenericSubheading
+		getColor(t.Error()),     // GenericTraceback
+		getColor(t.Text()),      // TextWhitespace
+	)
 
-	r := strings.NewReader(theme)
+	r := strings.NewReader(syntaxThemeXml)
 	style := chroma.MustNewXMLStyle(r)
+
 	// Modify the style to use the provided background
 	s, err := style.Builder().Transform(
 		func(t chroma.StyleEntry) chroma.StyleEntry {
@@ -599,6 +531,14 @@ func SyntaxHighlight(w io.Writer, source, fileName, formatter string, bg lipglos
 	return f.Format(w, s, it)
 }
 
+// getColor returns the appropriate hex color string based on terminal background
+func getColor(adaptiveColor lipgloss.AdaptiveColor) string {
+	if lipgloss.HasDarkBackground() {
+		return adaptiveColor.Dark
+	}
+	return adaptiveColor.Light
+}
+
 // highlightLine applies syntax highlighting to a single line
 func highlightLine(fileName string, line string, bg lipgloss.TerminalColor) string {
 	var buf bytes.Buffer
@@ -610,11 +550,11 @@ func highlightLine(fileName string, line string, bg lipgloss.TerminalColor) stri
 }
 
 // createStyles generates the lipgloss styles needed for rendering diffs
-func createStyles(config StyleConfig) (removedLineStyle, addedLineStyle, contextLineStyle, lineNumberStyle lipgloss.Style) {
-	removedLineStyle = lipgloss.NewStyle().Background(config.RemovedLineBg)
-	addedLineStyle = lipgloss.NewStyle().Background(config.AddedLineBg)
-	contextLineStyle = lipgloss.NewStyle().Background(config.ContextLineBg)
-	lineNumberStyle = lipgloss.NewStyle().Foreground(config.LineNumberFg)
+func createStyles(t theme.Theme) (removedLineStyle, addedLineStyle, contextLineStyle, lineNumberStyle lipgloss.Style) {
+	removedLineStyle = lipgloss.NewStyle().Background(t.DiffRemovedBg())
+	addedLineStyle = lipgloss.NewStyle().Background(t.DiffAddedBg())
+	contextLineStyle = lipgloss.NewStyle().Background(t.DiffContextBg())
+	lineNumberStyle = lipgloss.NewStyle().Foreground(t.DiffLineNumber())
 
 	return
 }
@@ -623,9 +563,20 @@ func createStyles(config StyleConfig) (removedLineStyle, addedLineStyle, context
 // Rendering Functions
 // -------------------------------------------------------------------------
 
+func lipglossToHex(color lipgloss.Color) string {
+	r, g, b, a := color.RGBA()
+
+	// Scale uint32 values (0-65535) to uint8 (0-255).
+	r8 := uint8(r >> 8)
+	g8 := uint8(g >> 8)
+	b8 := uint8(b >> 8)
+	a8 := uint8(a >> 8)
+
+	return fmt.Sprintf("#%02x%02x%02x%02x", r8, g8, b8, a8)
+}
+
 // applyHighlighting applies intra-line highlighting to a piece of text
-func applyHighlighting(content string, segments []Segment, segmentType LineType, highlightBg lipgloss.Color,
-) string {
+func applyHighlighting(content string, segments []Segment, segmentType LineType, highlightBg lipgloss.AdaptiveColor) string {
 	// Find all ANSI sequences in the content
 	ansiRegex := regexp.MustCompile(`\x1b(?:[@-Z\\-_]|\[[0-9?]*(?:;[0-9?]*)*[@-~])`)
 	ansiMatches := ansiRegex.FindAllStringIndex(content, -1)
@@ -663,6 +614,10 @@ func applyHighlighting(content string, segments []Segment, segmentType LineType,
 	inSelection := false
 	currentPos := 0
 
+	// Get the appropriate color based on terminal background
+	bgColor := lipgloss.Color(getColor(highlightBg))
+	fgColor := lipgloss.Color(getColor(theme.CurrentTheme().Background()))
+
 	for i := 0; i < len(content); {
 		// Check if we're at an ANSI sequence
 		isAnsi := false
@@ -697,12 +652,16 @@ func applyHighlighting(content string, segments []Segment, segmentType LineType,
 			// Get the current styling
 			currentStyle := ansiSequences[currentPos]
 
-			// Apply background highlight
+			// Apply foreground and background highlight
+			sb.WriteString("\x1b[38;2;")
+			r, g, b, _ := fgColor.RGBA()
+			sb.WriteString(fmt.Sprintf("%d;%d;%dm", r>>8, g>>8, b>>8))
 			sb.WriteString("\x1b[48;2;")
-			r, g, b, _ := highlightBg.RGBA()
+			r, g, b, _ = bgColor.RGBA()
 			sb.WriteString(fmt.Sprintf("%d;%d;%dm", r>>8, g>>8, b>>8))
 			sb.WriteString(char)
-			sb.WriteString("\x1b[49m") // Reset only background
+			// Reset foreground and background
+			sb.WriteString("\x1b[39m")
 
 			// Reapply the original ANSI sequence
 			sb.WriteString(currentStyle)
@@ -719,22 +678,24 @@ func applyHighlighting(content string, segments []Segment, segmentType LineType,
 }
 
 // renderLeftColumn formats the left side of a side-by-side diff
-func renderLeftColumn(fileName string, dl *DiffLine, colWidth int, styles StyleConfig) string {
+func renderLeftColumn(fileName string, dl *DiffLine, colWidth int) string {
+	t := theme.CurrentTheme()
+
 	if dl == nil {
-		contextLineStyle := lipgloss.NewStyle().Background(styles.ContextLineBg)
+		contextLineStyle := lipgloss.NewStyle().Background(t.DiffContextBg())
 		return contextLineStyle.Width(colWidth).Render("")
 	}
 
-	removedLineStyle, _, contextLineStyle, lineNumberStyle := createStyles(styles)
+	removedLineStyle, _, contextLineStyle, lineNumberStyle := createStyles(t)
 
 	// Determine line style based on line type
 	var marker string
 	var bgStyle lipgloss.Style
 	switch dl.Kind {
 	case LineRemoved:
-		marker = removedLineStyle.Foreground(styles.RemovedFg).Render("-")
+		marker = removedLineStyle.Foreground(t.DiffRemoved()).Render("-")
 		bgStyle = removedLineStyle
-		lineNumberStyle = lineNumberStyle.Foreground(styles.RemovedFg).Background(styles.RemovedLineNumberBg)
+		lineNumberStyle = lineNumberStyle.Foreground(t.DiffRemoved()).Background(t.DiffRemovedLineNumberBg())
 	case LineAdded:
 		marker = "?"
 		bgStyle = contextLineStyle
@@ -757,7 +718,7 @@ func renderLeftColumn(fileName string, dl *DiffLine, colWidth int, styles StyleC
 
 	// Apply intra-line highlighting for removed lines
 	if dl.Kind == LineRemoved && len(dl.Segments) > 0 {
-		content = applyHighlighting(content, dl.Segments, LineRemoved, styles.RemovedHighlightBg)
+		content = applyHighlighting(content, dl.Segments, LineRemoved, t.DiffHighlightRemoved())
 	}
 
 	// Add a padding space for removed lines
@@ -771,28 +732,30 @@ func renderLeftColumn(fileName string, dl *DiffLine, colWidth int, styles StyleC
 		ansi.Truncate(
 			lineText,
 			colWidth,
-			lipgloss.NewStyle().Background(styles.HunkLineBg).Foreground(styles.HunkLineFg).Render("..."),
+			lipgloss.NewStyle().Background(bgStyle.GetBackground()).Foreground(t.TextMuted()).Render("..."),
 		),
 	)
 }
 
 // renderRightColumn formats the right side of a side-by-side diff
-func renderRightColumn(fileName string, dl *DiffLine, colWidth int, styles StyleConfig) string {
+func renderRightColumn(fileName string, dl *DiffLine, colWidth int) string {
+	t := theme.CurrentTheme()
+
 	if dl == nil {
-		contextLineStyle := lipgloss.NewStyle().Background(styles.ContextLineBg)
+		contextLineStyle := lipgloss.NewStyle().Background(t.DiffContextBg())
 		return contextLineStyle.Width(colWidth).Render("")
 	}
 
-	_, addedLineStyle, contextLineStyle, lineNumberStyle := createStyles(styles)
+	_, addedLineStyle, contextLineStyle, lineNumberStyle := createStyles(t)
 
 	// Determine line style based on line type
 	var marker string
 	var bgStyle lipgloss.Style
 	switch dl.Kind {
 	case LineAdded:
-		marker = addedLineStyle.Foreground(styles.AddedFg).Render("+")
+		marker = addedLineStyle.Foreground(t.DiffAdded()).Render("+")
 		bgStyle = addedLineStyle
-		lineNumberStyle = lineNumberStyle.Foreground(styles.AddedFg).Background(styles.AddedLineNamerBg)
+		lineNumberStyle = lineNumberStyle.Foreground(t.DiffAdded()).Background(t.DiffAddedLineNumberBg())
 	case LineRemoved:
 		marker = "?"
 		bgStyle = contextLineStyle
@@ -815,7 +778,7 @@ func renderRightColumn(fileName string, dl *DiffLine, colWidth int, styles Style
 
 	// Apply intra-line highlighting for added lines
 	if dl.Kind == LineAdded && len(dl.Segments) > 0 {
-		content = applyHighlighting(content, dl.Segments, LineAdded, styles.AddedHighlightBg)
+		content = applyHighlighting(content, dl.Segments, LineAdded, t.DiffHighlightAdded())
 	}
 
 	// Add a padding space for added lines
@@ -829,7 +792,7 @@ func renderRightColumn(fileName string, dl *DiffLine, colWidth int, styles Style
 		ansi.Truncate(
 			lineText,
 			colWidth,
-			lipgloss.NewStyle().Background(styles.HunkLineBg).Foreground(styles.HunkLineFg).Render("..."),
+			lipgloss.NewStyle().Background(bgStyle.GetBackground()).Foreground(t.TextMuted()).Render("..."),
 		),
 	)
 }
@@ -848,7 +811,7 @@ func RenderSideBySideHunk(fileName string, h Hunk, opts ...SideBySideOption) str
 	copy(hunkCopy.Lines, h.Lines)
 
 	// Highlight changes within lines
-	HighlightIntralineChanges(&hunkCopy, config.Style)
+	HighlightIntralineChanges(&hunkCopy)
 
 	// Pair lines for side-by-side display
 	pairs := pairLines(hunkCopy.Lines)
@@ -860,8 +823,8 @@ func RenderSideBySideHunk(fileName string, h Hunk, opts ...SideBySideOption) str
 	rightWidth := config.TotalWidth - colWidth
 	var sb strings.Builder
 	for _, p := range pairs {
-		leftStr := renderLeftColumn(fileName, p.left, leftWidth, config.Style)
-		rightStr := renderRightColumn(fileName, p.right, rightWidth, config.Style)
+		leftStr := renderLeftColumn(fileName, p.left, leftWidth)
+		rightStr := renderRightColumn(fileName, p.right, rightWidth)
 		sb.WriteString(leftStr + rightStr + "\n")
 	}
 
@@ -876,54 +839,7 @@ func FormatDiff(diffText string, opts ...SideBySideOption) (string, error) {
 	}
 
 	var sb strings.Builder
-	config := NewSideBySideConfig(opts...)
-
-	if config.Style.ShowHeader {
-		removeIcon := lipgloss.NewStyle().
-			Background(config.Style.RemovedLineBg).
-			Foreground(config.Style.RemovedFg).
-			Render("⏹")
-		addIcon := lipgloss.NewStyle().
-			Background(config.Style.AddedLineBg).
-			Foreground(config.Style.AddedFg).
-			Render("⏹")
-
-		fileName := lipgloss.NewStyle().
-			Background(config.Style.ContextLineBg).
-			Foreground(config.Style.FileNameFg).
-			Render(" " + diffResult.OldFile)
-		sb.WriteString(
-			lipgloss.NewStyle().
-				Background(config.Style.ContextLineBg).
-				Padding(0, 1, 0, 1).
-				Foreground(config.Style.FileNameFg).
-				BorderStyle(lipgloss.NormalBorder()).
-				BorderTop(true).
-				BorderBottom(true).
-				BorderForeground(config.Style.FileNameFg).
-				BorderBackground(config.Style.ContextLineBg).
-				Width(config.TotalWidth).
-				Render(
-					lipgloss.JoinHorizontal(lipgloss.Top,
-						removeIcon,
-						addIcon,
-						fileName,
-					),
-				) + "\n",
-		)
-	}
-
 	for _, h := range diffResult.Hunks {
-		// Render hunk header
-		if config.Style.ShowHunkHeader {
-			sb.WriteString(
-				lipgloss.NewStyle().
-					Background(config.Style.HunkLineBg).
-					Foreground(config.Style.HunkLineFg).
-					Width(config.TotalWidth).
-					Render(h.Header) + "\n",
-			)
-		}
 		sb.WriteString(RenderSideBySideHunk(diffResult.OldFile, h, opts...))
 	}
 
@@ -944,8 +860,8 @@ func GenerateDiff(beforeContent, afterContent, fileName string) (string, int, in
 		removals  = 0
 	)
 
-	lines := strings.Split(unified, "\n")
-	for _, line := range lines {
+	lines := strings.SplitSeq(unified, "\n")
+	for line := range lines {
 		if strings.HasPrefix(line, "+") && !strings.HasPrefix(line, "+++") {
 			additions++
 		} else if strings.HasPrefix(line, "-") && !strings.HasPrefix(line, "---") {